Their problem wasn't so much the bigotry: The Vikings in "How To Train a Dragon" just kill the cute flying beasts. The real Vikings pillaged Europe all the way from Russia to Ireland.Paramount

I’ve seen “How to Train Your Dragon” twice. My daughter loves it (the lead dragon reminds us of her cat). And I think it’s pretty great too.

I don’t much mind what Entertainment Weekly calls the movie’s “layer of age-of-terror allegory about the ignorance bred by jingoism.” This refers to the fact that the Vikings in the film have been raised for seven generations to kill dragons: “It’s what we do.”

But the hero, Hiccup, an alienated, smart-mouthed teen, discovers that dragons are actually inclined to be lovable, sweet-tempered companions — if his fellow Vikings could only get over their own stubborn ignorance and prejudice and give the monsters a chance. It’s all been a misunderstanding, and in the end, dragons and Vikings learn to love one another.

My complaint is that this teaches kids there’s no such thing as monsters.

No, I’m not keen on telling kids that there are things that go bump in the night or beasts in their closet — that means I have to spend half the night with a terrified kid in my bed.

But monsters once served an important purpose. Monster stories once told us that evil exists and that we shouldn’t assume all motives are good and kind.

Sure, kids today are taught to yell, “Stranger danger!” or some such when approached at the mall, but you won’t find that sort of lesson in popular children’s books and cartoons. And, let the record show, some of those strangers really are a horrific, soul-sickening danger and not merely misunderstood.

I’m not so nostalgic as to believe that the world that produced the Grimm fairy tales is preferable to that which gave us “Monsters, Inc.” But the improvement didn’t come without drawbacks.

Meanness is no longer innate — it’s the unfortunate side effect of being misunderstood, the forgivable self-defense mechanism of victims.

Psychological explanations for why there are bad people have their place. What bothers me is that we tend to explain away the objectively evil as merely misunderstood and the misunderstood as objectively evil. We all sympathize with Tony Soprano, even though he’s a brutal murderer. Hannibal Lecter, it turns out, was a victim of the Nazis.

In the real world, how many times have we heard the motives of terrorists explained away as the regrettable but rational response of victims?

Meanwhile, merely disagreeing over gay marriage or health-care reform is a damning, self-dehumanizing act. Without trying to keep score in terms of political rhetoric, surely we can all agree that there’s a tendency to assume the other side is not only wrong, but has knowingly embraced evil motives.

Back in Hollywood, the least sympathetic people are often not true villains but merely “judgmental” people who refuse to understand the misunderstood on their own terms.

Which brings us back to “How to Train Your Dragon.” My daughter would have liked it less, but a refreshing and more realistic ending would have had the Vikings enlisting their new, fire-breathing pets in a massive invasion of Europe, laying waste to all they saw, and bringing the hated Christians to heel.